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Authors
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Thunga, M. ; Satapathy, B.K. ; Staudinger, U. ; Weidisch, R. ; Abdel-Goad, M. ; Janke, A. ; Knoll, K.
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Title
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Dynamic mechanical and rheological properties of binary S-(S/B)-S triblock copolymer blends
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Date
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01.01.2008
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Number
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15312
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Abstract
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The rheology and dynamic mechanical properties of binary block copolymer blends consisting of a symmetrical triblock copolymer with thermoplastic elastomeric behavior (LN4) and an asymmetrical thermoplastic triblock copolymer (LN3) were investigated. TEM images of the blends show a systematic variation in the morphologies from worms (20-0 wt % LN3) to cylinders (60-30 wt % LN3) to lamellae (100-70 wt % LN3) as a function of LN3 content. DMA analysis has revealed that the increase in LN3 content leads to a decrease in miscibility between the PS end blocks and the S/B middle block. The frequency and temperature dependence of the storage modulus (G), loss modulus (G), and complex viscosity (|*|) has been studied for LN4 (weakly segregated) and LN3 (strongly segregated) from their master curves. By comparing the rheological properties of these blend compositions at low-frequency regime, it is observed that with the increase in LN3 content the shear modulus and complex viscosity increase. Blend compositions with 70-100 wt % of LN3 show nonterminal behavior at reduced frequencies due to the presence of highly ordered microdomains when compared to blends with 0-20 wt % of LN3 content. van Gurp-Palmen plots were constructed to observe the transition from liquid- to solid-like behavior in the vicinity of order-to-disorder transition (ODT) temperature. ODT temperature increases as the thermoplastic LN3 content increases which are also confirmed by the Han plots. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 329-343, 2008
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Publisher
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Journal of Polymer Science: Part B: Polymer Physics
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Wikidata
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Citation
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Journal of Polymer Science: Part B: Polymer Physics 46 (2008) 329-343
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DOI
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https://doi.org/10.1002/polb.21304
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